Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh han
hoc thieu » toc thieu, hoc hien
trong dan » trong dang, trong san, trong tan
ho chieu » theo chieu, doi chieu, mot chieu
trinh su » trinh tu, trinh san, trinh cau
dan phan » doan phan, dan chan, van phan
phan cau » phan dau, phan cac, phan tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) OR (hoc thieu)) tinh - hanh ((trinh su) or (trinh toan)) dung trong dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) tinh - hanh ((trinh su) OR (trinh toan)) dung trong dan phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (hoc thieu)) tinh - hanh ((trinh su) or (trinh toan)) dung trong dan phan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (hoc thieu)) tinh - hanh ((trinh su) or (trinh toan)) dung trong dan phan cau*.